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Chapter 2. Prehension

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354 A pp e n dices<br />

Table A.l Degrees of freedom (df) of the upper limb<br />

Bones Joints (type) df Motions<br />

Pectoral Girdle-Shoulder<br />

Clavicle sternoclavicular 3 protraction & retraction<br />

(plane, synovial) elevation & depression<br />

upward & downward rotation<br />

scapula acromioclavicular 3<br />

(M<br />

mobile)<br />

(plane, synovial)<br />

coracoclavicular<br />

(ligament, fibrous)<br />

scapulothoracic<br />

(functional, fibrous,<br />

not a "true" joint)<br />

Shoulder- Arm<br />

humerus glenohumeral<br />

(ball and socket,<br />

s ynovial)<br />

Elbow-Forearm<br />

3 NOTE: interdependent<br />

motions about all pectoral<br />

girdle joints, for total of 3 df<br />

3 abduction & adduction<br />

flexion & extension<br />

internal & external rotation<br />

NOTE: when arm is above<br />

shoulder height, there is<br />

also motion about pectoral<br />

girdle joints<br />

ulna humeroulnar 2 flexion & extension<br />

(modified hinge,<br />

s ynovial)<br />

ulnar abduction & adduction<br />

radius humeroradial same as humeroulnar for<br />

(pivotal, synovial) flexion & extension and same<br />

as superior radioulnar in<br />

supination & pronation<br />

superior radioulnar joint<br />

(pivotal, synovial)<br />

the 3 radioulnar joints provide<br />

intermediate radioulnar joint 1 for rotation of the radius about<br />

(interosseus membrane, the ulna in pronation &<br />

fibrous) supination<br />

inferior radioulnar joint<br />

(pivotal, synovial)

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